The Union flag, referred to as the Stars and Stripes, symbolized team spirit and patriotism

https://ericksigh824.birchreport.com/posts/celebrating-heritage-the-importance-of-civil-war-flags-in-today-s-society

The Union flag, referred to as the Stars and Stripes, symbolized team spirit and patriotism, offering thirteen stripes and a box of blue with stars that represented both nation within the union.